diff --git a/src/corelib/time/qtimezoneprivate_chrono.cpp b/src/corelib/time/qtimezoneprivate_chrono.cpp
index 6c8a7218df7..c77c6eb5260 100644
--- a/src/corelib/time/qtimezoneprivate_chrono.cpp
+++ b/src/corelib/time/qtimezoneprivate_chrono.cpp
@@ -62,6 +62,15 @@ QChronoTimeZonePrivate::QChronoTimeZonePrivate(QByteArrayView id)
 QChronoTimeZonePrivate::~QChronoTimeZonePrivate()
         = default;
 
+QByteArray QChronoTimeZonePrivate::systemTimeZoneId() const
+{
+    if (const time_zone *zone = std::chrono::current_zone()) {
+        std::string_view name = zone->name();
+        return {name.begin(), qsizetype(name.size())};
+    }
+    return {};
+}
+
 QString QChronoTimeZonePrivate::abbreviation(qint64 atMSecsSinceEpoch) const
 {
     if (auto info = infoAtEpochMillis(m_timeZone, atMSecsSinceEpoch))
diff --git a/src/corelib/time/qtimezoneprivate_p.h b/src/corelib/time/qtimezoneprivate_p.h
index 27bbe5b6222..b3a86e9cdbd 100644
--- a/src/corelib/time/qtimezoneprivate_p.h
+++ b/src/corelib/time/qtimezoneprivate_p.h
@@ -241,6 +241,8 @@ public:
     QChronoTimeZonePrivate(QByteArrayView id);
     ~QChronoTimeZonePrivate() override;
 
+    QByteArray systemTimeZoneId() const override;
+
     QString abbreviation(qint64 atMSecsSinceEpoch) const override;
     int offsetFromUtc(qint64 atMSecsSinceEpoch) const override;
     int standardTimeOffset(qint64 atMSecsSinceEpoch) const override;